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Pensions and Other Post-retirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 3,011 $ 2,736 $ 6,022 $ 5,159
Interest cost 3,726 4,721 7,452 9,426
Expected return on plan assets (8,503) (9,658) (17,006) (19,311)
Amortization of prior service cost (credit) 46 112 92 108
Recognized net actuarial losses 3,935 2,534 7,870 5,111
Settlements 0 (2,363) 0 (2,363)
Net periodic benefit cost 2,215 2,808 4,430 2,856
Other Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 99 89 198 178
Interest cost 179 249 358 498
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (credit) (98) (101) (196) (202)
Recognized net actuarial losses 286 217 572 434
Settlements 0 0 0 0
Net periodic benefit cost $ 466 $ 454 $ 932 $ 908